Folding chair

Abstract

To provide a novel folding chair that can be stacked by devising a structure while having a folding function.SOLUTION: A folding chair includes a leg structure body 3 configured by connecting between upper end parts 11g1 and 21g1 and between 12g1 and 22g1 of a pair of front and rear X linkages 1 and 2 by a pair of seat frames 41a and 42a so as to be capable of opening and closing synchronously, where a seat 5 is formed between the seat frames 41a and 42a in a deployed state. The leg structure body 3 is polymerizable by inserting part of an inside leg frame 3B of the right and left leg frames 3A and 3B of an adjacent another same chair into an outside leg frame 3A of the right and left leg frames 3A and 3B configured downward from rotation shafts 33 and 34 by the X linkages 1 and 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a folding chair configured by connecting X-links so as to be synchronously opened and closed.

Background Art

[0002] This type of folding chair has generally been known as an outdoor item.

[0003] Conventional outdoor folding chairs can be leaned against or laid flat in a folded state and stored in a vehicle or warehouse.

[0004] For example, the folding chair described in Patent Document 1 has a structure in which the spaces between four support columns are connected by X-links, and the four corners of the seat are attached to each support column. It is configured such that when the four X-links are opened, it is in a use state, and when closed, it is in a folded state.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, for uses such as in an office rather than for camping and used indoors, there is no need to fold it up so small. On the contrary, a certain degree of texture and stability is desired.

[0007] Therefore, it is rather desirable that the folding chair can be stacked like a normal chair from the viewpoint of taking in and out. However, the normal stacking function has a structure in which the leg structure is asymmetric front and back, and stacking is realized by overlapping the front legs of the rear chair between the rear legs of the front chair. It is difficult to make the front and rear X-links of the folding chair asymmetric or to overlap them front and back.

[0008] The present invention has been made in view of such circumstances, and an object thereof is to realize a new folding chair that has a folding function and can be stacked by devising its structure.

Means for Solving the Problems

[0009] In order to achieve such an object, the present invention has taken the following means.

[0010] That is, in the folding chair of the present invention, the upper ends of a pair of front and rear X-links are connected by a pair of seat frames so as to be synchronously opened and closed to form a leg structure, and in the folding chair in which a seat is formed between the seat frames in the deployed state, the leg structure is self-standing while leaving the leg-open state between the lower ends of the X-links when the upper ends of the X-links are folded. A pair of outer link members that form one of the left and right leg frames configured below the rotation axis by an X-link, and a pair of inner link members that form the other of the left and right leg frames are provided with diagonal portions that gradually widen the distance between the outer link members and the distance between the inner link members downward from the rotation axis. In a state where the upper ends of the X-links are folded, a part of the other of the left and right leg frames of another same chair adjacent to one of the left and right leg frames can enter and overlap. It is characterized by this.

[0011] In this way, since the present invention devises the direction of the asymmetric structure in consideration of the characteristics of the folding chair, it is possible to effectively realize the stacking function also in the folding chair. In addition, since each of the pair of outer link members and the pair of inner link members has a diagonal portion that gradually widens the link distance downward from the rotation axis, the grounding width is widened by the diagonal portion.

[0012] Specifically , the former The outer link members form an outer leg frame by connecting the lower ends thereof with a grounding frame, and the inner link members form an inner leg frame by connecting the lower ends thereof with a grounding frame. If the inner leg frame of the chair adjacent to the inside of the outer leg frame can enter, by using a leg frame having a connection frame, the grounding state is stabilized, and the insertion and extraction of the leg frames before and after stacking can be performed smoothly.

[0013] Especially , diagonal if the lower part of the joint part is continuous with the grounding frame , s the insertion and extraction of the leg frames before and after stacking can be performed more smoothly.

[0014] At that time, it is desirable that a straight portion that keeps the distance between the links constant downward from the inclined portion is provided between the inclined portion and the grounding frame.

[0015] When the outer link member and the inner link member of the X-link open and close, the inclined portions are most likely to interfere with each other. On the other hand, if a spacer portion that widens the distance between the outer link member and the inner link member along the opposing direction of the X-link is provided on the rotation axis that rotatably connects between the outer link member and the inner link member, interference between the inclined portions can be avoided.

[0016] In a chair in which the lower end portions of the respective X-links are more open than the upper end portions in the folded state, when the upper end portions are brought closer compactly, the lower end portions are likely to interfere with each other. Therefore, such a stacking structure is particularly effective.

[0017] In particular, if the structure is such that the lower end portions of the respective X-links are more open than the upper end portions in order to stand on their own in the folded state, the self-standing function and the stacking function can be suitably compatible.

[0018] Also , if the lower frame of the elbow frame that functions as the seat frame is configured to approach or separate as the X-link deforms it is possible to avoid the elbows interfering with stacking.

[0019] Furthermore, if the back frames are erected respectively from the rear end portions of the pair of elbow frames, and a back is provided between the pair of back frames so as to bend from the center along with the operation of the X-link, it is possible to avoid the back interfering with stacking.

[0020] If the upper part of the rotation axis of the pair of link members constituting the X-link is bent to provide straight portions that are parallel to each other in the folded state, and the seat is folded between the straight portions, it is possible to avoid the seat interfering with stacking.

[0021] The back [[ID=)34]] It is folded to a position retracted behind the back frame is arranged in such a way that it is possible to avoid the back interfering with stacking.

Advantages of the Invention

[0022] According to the present invention described above, it is possible to provide a new folding chair that has a folding function and can be stacked by devising the structure.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0024] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0025] As shown in FIGS. 1 to 3, the folding chair X of this embodiment is configured to form a leg structure 3 by connecting the front X-link 1 and the rear X-link 2 that are paired front and rear so as to be synchronously opened and closed, and the elbow 4 and the seat 5 are formed on the upper end sides of the X-links 1 and 2. In particular, the folding chair X of this embodiment has a self-standing function and a stacking function in the folded state.

[0026] Specifically described, the front X-link 1 of the leg structure 3 includes an outer link member 11 located on the outer side in the facing direction and an inner link member 12 located on the inner side. The rear X-link 2 of the leg structure 3 includes an outer link member 21 located on the outer side in the facing direction and an inner link member 22 located on the inner side. The outer link members 11 and 21 are connected between the lower end portions 11e1 and 21e1 by a grounding frame 31 extending in the front-rear direction so as to be synchronously opened and closed to form an outer leg frame 3A, and the inner link members 12 and 22 are connected between the lower end portions 12e1 and 22e1 by a grounding frame 32 extending in the front-rear direction to form an inner leg frame 3B.

[0027] The outer link members 11 and 21 have a central straight portion 11a and 21a to which the rotation shafts 33 and 34 are attached, a first lower bending portion 11b and 21b located at the lower ends of the central straight portions 11a and 21a, and an inclined portion 11c and 21c extending while gradually widening the distance between the front and rear links downward from the first lower bending portion 11b and 21b, and a second lower bending portion 11d and 21d located at the lower ends of the inclined portions 11c and 21c, and a lower straight portion 11e and 21e extending while maintaining a constant distance between the front and rear links downward from the second lower bending portion, and the lower ends 11e1 and 12e1 of the straight portions 11e and 21e are continuous with the grounding frame 31. The first lower bending portions 11b and 21b and the second lower bending portions 11d and 21d are bent in the directions shown in FIGS. 5 and 8 in side view and not shown in FIGS. 4 and 7 in front view. That is, the first lower bending portions 11b and 21b and the second lower bending portions 11d and 21d are bent in the direction of widening the front-rear grounding width WA of the outer leg frame 3A.

[0028] The inner link members 12 and 22 also include a central straight portion 12a and 22a to which the rotation shafts 33 and 34 are attached, a lower first bent portion 12b and 22b located at the lower ends of the central straight portions 12a and 22a, an inclined portion 12c and 22c extending while gradually widening the distance between the front and rear links downward from the lower first bent portions 12b and 22b, a lower second bent portion 12d and 22d located at the lower ends of the inclined portions 12c and 22c, and a lower straight portion 12e and 22e extending while maintaining a constant distance between the front and rear links downward from the lower second bent portions 12d and 22d. The lower ends 12e1 and 22e1 of the straight portions 12e and 22e are connected to the ground frame 32. The lower first bent portions 12b and 22b and the lower second bent portions 12d and 22d are bent in a direction that does not appear in FIGS. 4 and 7 when viewed from the front but appears in FIGS. 5 and 8 when viewed from the side. That is, the lower first bent portions 12b and 22b and the lower second bent portions 12d and 22d are bent in a direction that widens the front and rear ground contact widths WB of the inner leg frame 3B.

[0029] The rotation shaft 33 (34) is set at approximately the center in the longitudinal direction of the link members 11 and 12 (21 and 22) that constitute the X link 1 (2).

[0030] In the space S (stacking space S) of FIG. 1 surrounded by the outer leg frame 3A composed of the outer link members 11 and 21e and the ground frame 31, when adjacent folding chairs X of the same type are adjacent, the inner leg frame 3B composed of the inner link members 12 and 22 of the adjacent folding chair X and the ground frame 32 is set to have dimensional relationships such that it can pass through and fit (see FIG. 10). That is, in this regard, the leg structure 3 of this folding chair X has a left-right asymmetric structure at least in the relationship between the outer leg frame 3B and the inner leg frame 3B.

[0031] On the other hand, the outer link members 11 and 21 have an upper bent portion 11f and 21f located at the upper ends of the central straight portions 11a and 21a, and an upper straight portion 11g and 21g extending while maintaining a constant distance between the front and rear links upward from the upper bent portions 11f and 21f. The upper bent portions 11f and 21f are bent in a direction that does not appear in FIGS. 5 and 8 when viewed from the side but appears in FIGS. 4 and 7 when viewed from the front.

[0032] The inner link members 12 and 22 have upper bent portions 12f and 22f located at the upper ends of the central straight portions 12a and 22a, and upper straight portions 12g and 22g that extend upward from the upper bent portions 12f and 22f while maintaining a constant distance between the front and rear links. The upper bent portions 12f and 22f are bent in the direction shown in FIGS. 4 and 7 when viewed from the front, which does not appear in FIGS. 5 and 8 when viewed from the side, or in the direction on the back side.

[0033] The outer link member 11 and the inner link member 12 that constitute the front X-link 1 are connected via a support shaft 31 at the central straight portions 11a and 12a, and the outer link member 21 and the inner link member 22 that constitute the rear X-link 2 are connected via a support shaft 32 at the central straight portions 21a and 22a. The support shafts 31 and 32 have spacer portions 31a and 31b that secure a certain distance between the outer link member 11 (21) and the inner link member 12 (22) that constitute the front X-link 1 (rear X-link 2) as shown in FIG. 5.

[0034] That is, by providing the upper bent portions 11f and 12f, when the front X-link 1 is closed as shown in FIGS. 6 and 7, the pair of upper straight portions 11g and 12g both stand vertically and are parallel when viewed from the front. By providing the upper bent portions 21f and 22f, when the rear X-link 2 is closed as shown in FIGS. 6 and 7, the pair of upper straight portions 21g and 22g both stand vertically and are parallel when viewed from the front.

[0035] On the other hand, as shown in FIGS. 3 and 11, the leg structure 3 connects between the upper end portions 11g1 and 21g1 of the pair of outer link members 11 and 21 with a circular elbow frame 41, and connects between the upper end portions 12g1 and 22g1 of the pair of inner link members 12 and 22 with a circular elbow frame 42. The lower frames 41a and 42a that extend in the front-rear direction among the elbow frames 41 and 42 are used as seat frames, and a stretching ground 51 is spanned between the seat frames 41a and 42a to form the seat 5.

[0036] The lower frame 41a (42a) that functions as a seat frame, as shown in Fig. 11, integrally attaches a pair of channel-shaped brackets 43, 43 (44, 44) at two locations on the front and rear sides of the lower end. The upper ends of the outer link member 11 (inner link member 12) are rotatably connected to these brackets 43 (44) by an axis m in the front-rear direction. As a result, the elbow frames 41, 42 are entirely rotatable around the axis m in the front-rear direction.

[0037] The elbow frames 41, 42 rotate inward to a position where they contact a stopper (not shown) and are temporarily held at positions on the upper extension lines of the link members that constitute the X-links 1, 2 when folded.

[0038] The seat fabric 51 that constitutes the seat 5 is made of a cloth material and is stretched between the left and right lower frames 41a, 42a in a state where the lower frames 41a, 42a that function as seat frames pass through the bag-shaped sewing parts 51a formed at the left and right edge parts.

[0039] As shown in Figs. 3 and 11, the elbow frames 41, 42 form a circular shape connecting the lower frames 41a, 42a that function as seat frames, the upper frames 41b, 42b that function as elbow rests, and the front frames 41c, 42c and rear frames 41d, 42d located in front and behind them. By being integrated with the back and elbows in this way, it has a simple and structurally advantageous structure. Since the elbows are circular, the brackets 43, 44 that are the leg attachment parts can be rationally arranged.

[0040] Incidentally, in the elbow frames 42 and 41 of this embodiment, as shown in FIG. 3, a gap CL is provided in the middle of the lower frame portions 41a and 42a that function as seat frames, and resin connection members 41a1, 41a2, 42a1, and 42a2 shown in FIG. 3 can be filled in this gap. For example, regarding the lower frame portion 42a shown in FIGS. 3 and 12, after passing the bag-shaped sewing portion 51a of the webbing 51 that constitutes the seat 5 through this gap CL to the lower frame portion 42a, the resin connection members 42a1 and 42a2 are fitted into the gap CL to cover the bag-shaped sewing portion 51a, thereby completing the attachment of the webbing 51a. The connection members 42a1 and 42a2 have inclined surfaces sl1 and sl2 that can be fitted together from the lateral direction, and protrusions pr1 and pr2 that fit into the inner diameter of the pipe member constituting the lower frame portion 42a are provided on the opposite surfaces. Then, after fitting the connection members 42a1 and 42a2 together, a screw f is passed through the screw insertion hole h provided in the connection member 42a1 and screwed into the screw hole n provided in the connection member 41a2 for fixation to prevent detachment. The same applies to the connection member 42a1 in FIG. 3.

[0041] By doing so, the cloth can be sewn in advance to make the webbing 51, and the strength of the cloth and the workability of sewing can be improved. The elbow frames 41 and 42 can also ensure strength, and it is possible to avoid damaging the webbing cloth at the pipe end face.

[0042] Furthermore, as shown in FIGS. 1 to 3, in this embodiment, a backrest 6 is configured behind and above the elbow 4 and the seat 5. The backrest 6 is configured by stretching a webbing 63 between the left and right backrest frames 61 and 62. The backrest frames 61 and 62 are integrally provided to protrude upward from behind the elbow frames 41 and 42. The protruding direction is the direction in which the front frames 41c and 42c and the rear frames 41d and 41e extend in a front view, and is tilted backward from the direction in which the rear frames 41d and 42d extend in a side view.

[0043] On the other hand, the webbing 63 is made of cloth, and is stretched between the left and right backrest frames 61 and 62 with the backrest frames 61 and 62 passed through the bag-shaped sewing portions 63a and 63a formed at the left and right edge portions.

[0044] Note that grounding members 35 are fitted from below at two positions, front and rear, of the grounding frames 31 and 32.

[0045] Also, at the lower ends 11e1, 21e1, 12e1, and 22e1 of the straight portions 11e, 21e, 12e, and 22e, R portions are formed for smoothly connecting to the grounding frames 31 and 32.

[0046] Next, the functions of this embodiment will be described.

[0047] First, as shown in FIG. 4, in the folding chair X of this embodiment, the upper bent portions 11f, 21f, 12f, and 22f are bent in a direction to widen the distance between the lower ends 11e1 and 12e1 (21e1 and 22e1) of the X-links 1 and 2. By operating the X-links 1 and 2, in the closed state until the upper straight portions 11g, 12g (21g, 22g) become substantially perpendicular and parallel to each other as shown in FIG. 7, the distance L1 between the lower ends 11e1 and 12e1 (21e1 and 22e1) is in an open-leg state wider than the distance L2 between the upper ends 11g1 and 1, 2g1 (21g1 and 22g1), and the folding chair X stands on its own.

[0048] At this time, the stretched ground 51 of the seat 5 is folded into the predetermined gap L2 between the upper straight portions 11g and 21g (12g and 22g) so as to be folded in two at the center as shown in FIG. 8 as the X-links 1 and 2 are folded, so as not to interfere with the opening and closing of the X-links 1 and 2.

[0049] The stretched ground 63 of the backrest 6 also retracts behind the back frames 61 and 62 so as to be folded in two at the center as shown in FIG. 8 as the X-links 1 and 2 are opened and closed, so as not to interfere with the opening and closing of the X-links.

[0050] Before and after the folding operation, first, a pair of elbow frames 41 and 42 are in an opposed position with a vertical posture in the unfolded state shown in FIG. 4, and by lifting the upper frame 41b (42b) that functions as an armrest, the elbow frames 41 and 42 maintain a vertical posture while the X-links 1 and 2 deform in the folding direction, and accordingly, while maintaining the opposed relationship, they approach each other from the state of FIG. 4 to the state of FIG. 7. By performing the reverse operation, they move from the state of FIG. 7 to the state of FIG. 4.

[0051] That is, the elbow frames 41 and 42 are also foldable / unfoldable along with the operation of the X-links 1 and 2.

[0052] As is prominent in the folded state of FIG. 6, the pair of elbow frames 41 and 42 are curved so that a maximum opposed gap Δ occurs in the middle part in plan view.

[0053] Since the back frames 61 and 62 are on the standing extension lines of the front frames 41c and 42c and the rear frames 41d and 42d of the elbow frames 41 and 42 in front view, the back frames 61 and 62 also approach each other while maintaining the opposed relationship as they shift from the unfolded state shown in FIG. 4 to the folded state shown in FIG. 7.

[0054] In the folded state shown in FIG. 7, the leg opening width L1 of the X-links 1 and 2 of the folding chair X is also wider than the distance L3 between the pair of elbow frames 41 and 42 and the distance L4 between the pair of back frames 61 and 61, and in this regard, a stable self-standing state is also ensured.

[0055] Further, in the folding chair X of the present embodiment, among the leg structures 3 including the X-links 1 and 2, since the inner leg frame 3B of the folding chair X adjacent to the stacking space S of the outer leg frame 3A shown in FIG. 10 enters, as shown in FIG. 9, the outer leg frame 3A constituting one of the chairs adjacent to each other on the left and right and the inner leg frame 3B constituting the other chair can be partially overlapped and horizontally stacked in the lateral direction.

[0056] Before and after stacking, as shown in FIG. 10, when the lower straight portions 12e and 22e of the inner leg frame 3B pass inside the lower straight portions 11e and 21e of the outer leg frame 3A, they can be brought into contact and guided, so that the insertion and removal can be performed smoothly.

[0057] As another function, in the states of FIGS. 1, 2, and 4 where the X-links 1 and 2 are deployed, the tension balance between the tension area 51 of the seat 5 and the tension area 63 of the backrest 6 is adjusted so that the tension area 63 of the backrest 6 that forms the backrest 6 protrudes earlier than the tension area 51 of the seat 5 that forms the seat 5 to hold the X-links 1 and 2 open.

[0058] That is, when the tension area 51 of the seat 5 is configured to stretch earlier than the tension area 63 of the backrest 6, when sitting, the tension area 51 of the seat 5 is pulled in the direction in which it bends, and the X-links 1 and 2 tend to close. When they tend to close, the tension area 63 of the backrest 6 becomes even looser and it becomes difficult to maintain the posture. In contrast, in this embodiment, the tension area 63 of the backrest 6 protrudes first in the state where it is most open from the folded state, and the tension area 63 of the backrest 6 holds the X-links 1 and 2 open. At this time, the tension area 51 of the seat 5 is in a slightly loose state (not stretched). By doing so, an effect can be obtained that unnecessary behavior is less likely to occur when sitting.

[0059] In this embodiment, as shown in FIG. 13, a document holder 7 is made detachable from the leg structure 3. This document holder 7 is made of a flexible material such as cloth, and cylindrical attachment portions 72 that can be opened and closed by hook-and-loop fasteners are provided on both sides of the document holder main body 71, and the cylindrical attachment portions 72 are attached so as to span between the upper straight portions 11g and 21g of the outer leg frames 11 and 21. Since the upper straight portions 11g and 21g maintain parallelism with a predetermined distance L2 between the upper straight portions 12g and 22g when folded as shown in FIG. 7, the document holder 7 does not interfere with folding. Of course, it is also possible to attach the document holder 7 between the upper straight portions 12g and 22g of the inner leg frames 12 and 22.

[0060] By doing so, when sitting, the document holder 7 will not get in the way and can be accessed from the side, making it easy to take in and out documents and the like. Also, it is possible to fold the folding chair X while it is attached, and even when the document holder 7 has a structure where the outlet opens upward as shown in the figure, when folded, the outlet faces upward, so even if an item such as a notebook computer PC is inserted, the item will not spill out and the attachment and detachment will be easy.

[0061] As described above, in the folding chair X of the present embodiment, the upper ends 11g1, 21g1 and 12g1, 22g1 between a pair of front and rear X-links 1, 2 are connected by a pair of seat frames 41a, 42a so as to be synchronously opened and closed to form a leg structure 3. In a state where a seat 5 is formed between the seat frames 41a, 42a in the unfolded state, the leg structure 3 is formed on the outer leg frame 3A of the left and right leg frames 3A, 3B formed below the rotation axes 33, 34 by the X-links 1, 2, and a part of the inner leg frame 3B of the left and right leg frames 3A, 3B of another same chair adjacent thereto can be inserted and overlapped.

[0062] In this way, since the present embodiment devises the direction of the asymmetric structure in consideration of the characteristics of the folding chair X, it becomes possible to effectively realize the stacking function also in the folding chair X.

[0063] Specifically, a pair of front and rear X-links 1, 2 each include an outer link member 11, 21 located on the outer side in the opposite direction and an inner link member 12, 22 located on the inner side. The outer link members 11, 21 connect the lower ends with a grounding frame 31 to form the outer leg frame 3A, and the inner link members 12, 22 connect the lower ends with a grounding frame 32 to form the inner leg frame 3B, and are configured such that the inner leg frame 3B of an adjacent chair enters inside the outer leg frame 3A.

[0064] In this way, by using the leg frames 3A, 3B having the connection frames 31, 32, the grounding state is stabilized, and the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed smoothly.

[0065] In particular, each of the pair of outer link members 11, 21 and the pair of inner link members 12, 22 has inclined portions 11c, 21c, 12c, 22c that gradually widen the link - to - link distance downward from the rotation axes 33, 34, and the lower portions of the inclined portions 11c, 21c, 12c, 22c are connected to the grounding frames 31, 32, forming a structure.

[0066] In this way, the presence of the inclined portions 11c, 21c, 12c, 22c widens the grounding width, and the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed more smoothly.

[0067] At this time, between the inclined portions 11c, 21c, 12c, 22c and the grounding frames 31, 32, there are straight portions 11e, 21e, 12e, 22e that keep the link - to - link distance constant downward from the inclined portions 11c, 21c, 12c, 22c. Therefore, the insertion and removal of the leg frames 3A, 3B before and after stacking can be performed even more smoothly.

[0068] When the outer link members 11 (21) and the inner link members 12 (22) of the X - link 1 (2) open and close, the inclined portions 11c and 12c (21c and 22c) are most likely to interfere. In contrast, on the rotation axes 33, 34 that rotatably connect between the outer link members 11, 21 and the inner link members 12, 22, there are provided spacer portions 33a, 34a that widen the intervals between the outer link member 11 and the inner link member 12, and between the outer link member 21 and the inner link member 22 along the opposing directions of the X - links 1, 2. By doing so, interference between the inclined portions can be avoided.

[0069] And in this embodiment, in the folded state, the lower - end portions 11e1, 12e1 (21e1, 22e1) of each X - link 1 (2) are more open than the upper - end portions 11g1, 12g1 (21g1, 22g1), and when the upper - end portions 11g1, 12g1 (21g1, 22g1) are brought closer, the lower - end portions are likely to interfere with each other. Therefore, it is effective.

[0070] Particularly, in this embodiment, in order to enable self-standing in the folded state, the lower ends 11e1, 12e1 (21e1, 22e1) of each of the X-links 1, 2 are open wider than the upper ends 11g1, 12g1 (21g1, 22g1), so that the self-standing function and the stacking function can be preferably compatible with each other.

[0071] In addition, the elbow frames 41, 42 are provided so as to be foldable / unfoldable in conjunction with the folding / unfolding operation of the seat frames 41a, 42a, so that the elbows 4 are prevented from interfering with stacking.

[0072] Furthermore, the back frames 61, 62 are erected respectively from the rear parts of the pair of elbow frames 41, 42, and a back 6 is provided between the pair of back frames 61, 62 so as to bend from the center as the X-link operates, so that the back 6 is prevented from interfering with stacking.

[0073] Also, the pair of link members 11, 12 (21, 22) constituting the X-link 1 (2) are bent above the rotation axes 33 (34), and straight portions 11g, 12g (21g, 22g) that are parallel to each other in the folded state are provided, and the seat 5 is folded between the straight portions 11g, 12g (21g, 22g), so that the seat 5 is prevented from interfering with stacking.

[0074] Furthermore, since the back 6 is folded at a position displaced from above the leg structure 3 in the direction facing the front and rear X-links 1, 2 in the folded state, the back 6 is prevented from interfering with stacking.

[0075] As described above, one embodiment of the present invention has been described, but the specific configuration of each part is not limited to the above-described embodiment only.

[0076] For example, in the above embodiment, the extending direction of the front link or the rear link constituting the X-link is changed by the bent portion, but it can also be configured similarly by the curved portion.

[0077] Moreover, even in a configuration without the lower straight line portion of the above-described embodiment, the stacking function and the self-standing function can be effectively realized.

[0078] Other configurations can also be variously modified without departing from the gist of the present invention.

Explanation of Reference Numerals

[0079] X... Folding chair 1... X link (front link) 2... X link (rear link) 3... Leg structure 3A... Outer leg frame 3B... Inner leg frame 4... Elbow 5... Seat 6... Back 11, 21... Outer link members 11c, 21c... Diagonal portions 11e, 21e... Straight line portions 11e1, 21e1... Lower end portions 11g1, 21g1... Upper end portions 12, 22... Inner link members 12c, 22c... Diagonal portions 12e, 22e... Straight line portions 12e1, 22e1... Lower end portions 12g1, 22g1... Upper end portions 31, 32... Grounding frames 33, 34... Rotation axes 33a, 34a... Spacer portions 41, 42... Elbow frames 41a, 42a... Seat frames 61, 62... Back frames

Claims

1. In a folding chair in which a leg structure is configured by connecting the upper ends of a pair of front and rear X-links with a pair of seat frames so as to be synchronously opened and closed, and a seat is formed between the seat frames in the deployed state, the leg structure is self-standing while leaving the leg-open state between the lower ends of the X-links when the upper ends of the X-links are folded, a pair of outer link members that constitute one of the left and right leg frames configured below the rotation axis by the X-link, and a pair of inner link members that constitute the other of the left and right leg frames are provided with diagonal portions that gradually widen the distance between the outer link members and the distance between the inner link members downward from the rotation axis, the leg structure is made such that a part of the other of the left and right leg frames of another same chair adjacent to one of the left and right leg frames can enter and overlap when the upper ends of the X-links are in a folded state, characterized in that it is a folding chair.

2. The outer link members form an outer leg frame by connecting the lower ends with a grounding frame, the inner link members form an inner leg frame by connecting the lower ends with a grounding frame, and the inner leg frame of a chair adjacent to the inside of the outer leg frame can enter, the folding chair according to claim 1.

3. The folding chair according to claim 2, wherein the lower part of the diagonal portion is continuous with the grounding frame.

4. The folding chair according to claim 3, having a straight portion that keeps the distance between the links constant downward from the diagonal portion between the diagonal portion and the grounding frame.

5. A spacer portion that widens the distance between the outer link member and the inner link member along the opposing direction of the X-link is provided on the rotation axis that rotatably connects between the outer link member and the inner link member, the folding chair according to claim 3 or 4.

6. In the folded state, the distance between the lower ends of each X-link is wider than the distance between the upper ends, the folding chair according to any one of claims 1 to 5.

7. The folding chair according to claim 6, being self-standing in the folded state.

8. The lower frame of the elbow frame that functions as the seat frame is configured to approach or separate as the X-link deforms, the folding chair according to any one of claims 1 to 7.

9. A backrest is erected from the rear end portions of the pair of elbow frames, and a back is provided between the pair of backrests so as to bend from the center as the X-link operates, the folding chair according to claim 8.

10. The folding chair according to any one of claims 1 to 9, wherein a pair of link members constituting an X-link is bent upward from a rotation axis thereof, and a straight portion that is parallel to each other in a folded state is provided, and a seat is folded between the straight portions.

11. The folding chair according to claim 9, wherein the backrest is folded at a position retracted rearward of the back frame.

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